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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
nanomaterial aspect ratio/shape
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2019
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference
Reference Type:
other: unpublished study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Principles of method if other than guideline:
Image analysis: manual image analysis according to REACH criteria (NanoDefine ParticleSizer)
Guidelines from NanoDefine are applied:
Method selection according to Gaillard et al., Nanoscale Adv., 2019, 1, 781
TEM image evaluation according to Verleysen et al., Materials 2019, 12, 2274; doi:10.3390/ma12142274
GLP compliance:
no
Type of method:
transmission electron microscopy
Details on methods and data evaluation:
Sample Preparation
A few mg of the previously wobbled/shaken pigment powder was dispersed in distillated water in an ultrasonic bath. A droplet of the well dispersed and diluted pigment dispersion was transferred to a TEM-grid (Cu) coated with a polymer support film (Formva).

Test material

Constituent 1
Chemical structure
Reference substance name:
N,N'-(2-chloro-1,4-phenylene)bis[4-[(4-chloro-2-nitrophenyl)azo]-3-hydroxynaphthalene-2-carboxamide]
EC Number:
252-772-5
EC Name:
N,N'-(2-chloro-1,4-phenylene)bis[4-[(4-chloro-2-nitrophenyl)azo]-3-hydroxynaphthalene-2-carboxamide]
Cas Number:
35869-64-8
Molecular formula:
C40H23Cl3N8O8
IUPAC Name:
N,N'-(2-chloro-1,4-phenylene)bis{4-[(4-chloro-2-nitrophenyl)diazenyl]-3-hydroxy-2-naphthamide}
Test material form:
solid: nanoform

Data gathering

Instruments:
Zeiss EM910 100kV
Calibration:
no data
Reproducibility:
no data

Results and discussion

Shape description
Key result
Shape:
rod
Remarks on result:
other: The material is assigned to the “elongated” shape category.
Aspect ratio
Key result
Remarks on result:
other: D50= 3,5:1

Applicant's summary and conclusion

Conclusions:
The particles have a median aspect ratio of 3,5:1.
The material is assigned to the “elongated” shape category. The shape is “rod”.